Re: [GTA04] When is the next and more powerful openmoko releasing
Hi Nikolaus, The story reads like a novel, with another cliffhanger every time:-) Keep up the good work! Kind regards, Ed On Sat, 2010-11-13 at 08:50 +0100, Dr. H. Nikolaus Schaller wrote: Hi all, time for another update. Am 06.11.2010 um 12:35 schrieb Sylvain Paré: Thanks for the news Yesterday I received the second board where we did populate the TPS65950 (power controller). The results of measurements are: * the 32 kHz RTC clock is operating * when inserting a battery, most voltages are available as expected Bad news: * we have a short circuit on the 1V8 rail I have spent most of the night and this morning to track this down. It appears to be a solder short circuit under the TPS chip (a 0.4 mm pitch BGA). So I am currently sitting at our SMD rework company and looking over the shoulder of the CTO who has a lot of experience. Unfortunately I can't make photos. We already have unsoldered the TPS chip (that needs a really sophisticated machine) and the short has disappeared. The next step is to solder it back again and do the next tests. If that works, i.e. we get all voltages from the power controller, the 26 MHz oscillator should also start working. If that is ok, the OMAP and the POP memory will be soldered. Maybe we manage to get it today. Then, we can see if the CPU is doing something. Current status: the 1.8V is now working but the VDD2 (1.2 V) not. The TPS chip aborts the power up sequence early. We could solve that by adding a jump start resistor. Rene will upload some photos of the board and we will post a link. Here: http://download.goldelico.com/gta04/images/DSC00671.jpg http://download.goldelico.com/gta04/images/DSC00672.jpg Then, we soldered the OMAP3530 and Pop Memory chip and connected RS232: http://download.goldelico.com/gta04/images/DSC00679.jpg It did identify itself as 40W on the RS232 but did not boot beyond that. Fortunately the OMAP has a ROM bootloader (which generates the 40W sequence) and we could use it to download a special second stage boot-loader that has a simple commandline console on RS232. Note that it must fit into 64k SRAM built into the OMAP chip. So we are back to C64 times :) With this tool, we could identify that the (external) SDRAM has a stuck-at-1 error on a single bit-line. So we expected another soldering issue and had the OMAP+Pop replaced on Monday. But the error pattern remained the same! Unexpectedly, we were able to put the board into a 3D X-Ray machine on Tuesday (during Electronica Fair). Here are machine results: http://www.yxlon.com/y.Cheetah http://download.goldelico.com/gta04/images/2009%20Xray/ Fortunately it is *not* a soldering issue. And likely not a PCB production issue. Yesterday late at night we found the problem. It is a bad BGA ball assignment in our component library. VDDS_MEM (1.8V) is assigned to B17 instead of B18. And, B17 is data line 14 of the SDRAM and should have been left NC. Therefore we have tied one data line to a high-level... I think we can fix that for our samples but it needs some time and we run out of components for the samples. Especially memory chips have quite a long lead time. For the series version this will be very easy to fix. Nikolaus ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [GTA04] When is the next and more powerful openmoko releasing
Am 13.11.2010 um 09:23 schrieb Ed Kapitein: Hi Nikolaus, The story reads like a novel, with another cliffhanger every time:-) Well, what else can be the destiny of a Freerunner :-) Keep up the good work! Thanks, Nikolaus ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [GTA04] When is the next and more powerful openmoko releasing
Nikolaus, if you need a XRAY machine again, I could probably help you; I work for a company which produces those XRay inspection machines. A. On Sat, 13 Nov 2010, Dr. H. Nikolaus Schaller wrote: Hi all, time for another update. Am 06.11.2010 um 12:35 schrieb Sylvain Paré: Thanks for the news Yesterday I received the second board where we did populate the TPS65950 (power controller). The results of measurements are: * the 32 kHz RTC clock is operating * when inserting a battery, most voltages are available as expected Bad news: * we have a short circuit on the 1V8 rail I have spent most of the night and this morning to track this down. It appears to be a solder short circuit under the TPS chip (a 0.4 mm pitch BGA). So I am currently sitting at our SMD rework company and looking over the shoulder of the CTO who has a lot of experience. Unfortunately I can't make photos. We already have unsoldered the TPS chip (that needs a really sophisticated machine) and the short has disappeared. The next step is to solder it back again and do the next tests. If that works, i.e. we get all voltages from the power controller, the 26 MHz oscillator should also start working. If that is ok, the OMAP and the POP memory will be soldered. Maybe we manage to get it today. Then, we can see if the CPU is doing something. Current status: the 1.8V is now working but the VDD2 (1.2 V) not. The TPS chip aborts the power up sequence early. We could solve that by adding a jump start resistor. Rene will upload some photos of the board and we will post a link. Here: http://download.goldelico.com/gta04/images/DSC00671.jpg http://download.goldelico.com/gta04/images/DSC00672.jpg Then, we soldered the OMAP3530 and Pop Memory chip and connected RS232: http://download.goldelico.com/gta04/images/DSC00679.jpg It did identify itself as 40W on the RS232 but did not boot beyond that. Fortunately the OMAP has a ROM bootloader (which generates the 40W sequence) and we could use it to download a special second stage boot-loader that has a simple commandline console on RS232. Note that it must fit into 64k SRAM built into the OMAP chip. So we are back to C64 times :) With this tool, we could identify that the (external) SDRAM has a stuck-at-1 error on a single bit-line. So we expected another soldering issue and had the OMAP+Pop replaced on Monday. But the error pattern remained the same! Unexpectedly, we were able to put the board into a 3D X-Ray machine on Tuesday (during Electronica Fair). Here are machine results: http://www.yxlon.com/y.Cheetah http://download.goldelico.com/gta04/images/2009%20Xray/ Fortunately it is *not* a soldering issue. And likely not a PCB production issue. Yesterday late at night we found the problem. It is a bad BGA ball assignment in our component library. VDDS_MEM (1.8V) is assigned to B17 instead of B18. And, B17 is data line 14 of the SDRAM and should have been left NC. Therefore we have tied one data line to a high-level... I think we can fix that for our samples but it needs some time and we run out of components for the samples. Especially memory chips have quite a long lead time. For the series version this will be very easy to fix. Nikolaus ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [GTA04] When is the next and more powerful openmoko releasing
Am 13.11.2010 um 12:15 schrieb Alexander Lehner: Nikolaus, if you need a XRAY machine again, I could probably help you; I work for a company which produces those XRay inspection machines. A. That is great to know! Although I hope we don't need it again :---) Have a nice weekend, Nikolaus On Sat, 13 Nov 2010, Dr. H. Nikolaus Schaller wrote: Hi all, time for another update. Am 06.11.2010 um 12:35 schrieb Sylvain Paré: Thanks for the news Yesterday I received the second board where we did populate the TPS65950 (power controller). The results of measurements are: * the 32 kHz RTC clock is operating * when inserting a battery, most voltages are available as expected Bad news: * we have a short circuit on the 1V8 rail I have spent most of the night and this morning to track this down. It appears to be a solder short circuit under the TPS chip (a 0.4 mm pitch BGA). So I am currently sitting at our SMD rework company and looking over the shoulder of the CTO who has a lot of experience. Unfortunately I can't make photos. We already have unsoldered the TPS chip (that needs a really sophisticated machine) and the short has disappeared. The next step is to solder it back again and do the next tests. If that works, i.e. we get all voltages from the power controller, the 26 MHz oscillator should also start working. If that is ok, the OMAP and the POP memory will be soldered. Maybe we manage to get it today. Then, we can see if the CPU is doing something. Current status: the 1.8V is now working but the VDD2 (1.2 V) not. The TPS chip aborts the power up sequence early. We could solve that by adding a jump start resistor. Rene will upload some photos of the board and we will post a link. Here: http://download.goldelico.com/gta04/images/DSC00671.jpg http://download.goldelico.com/gta04/images/DSC00672.jpg Then, we soldered the OMAP3530 and Pop Memory chip and connected RS232: http://download.goldelico.com/gta04/images/DSC00679.jpg It did identify itself as 40W on the RS232 but did not boot beyond that. Fortunately the OMAP has a ROM bootloader (which generates the 40W sequence) and we could use it to download a special second stage boot-loader that has a simple commandline console on RS232. Note that it must fit into 64k SRAM built into the OMAP chip. So we are back to C64 times :) With this tool, we could identify that the (external) SDRAM has a stuck-at-1 error on a single bit-line. So we expected another soldering issue and had the OMAP+Pop replaced on Monday. But the error pattern remained the same! Unexpectedly, we were able to put the board into a 3D X-Ray machine on Tuesday (during Electronica Fair). Here are machine results: http://www.yxlon.com/y.Cheetah http://download.goldelico.com/gta04/images/2009%20Xray/ Fortunately it is *not* a soldering issue. And likely not a PCB production issue. Yesterday late at night we found the problem. It is a bad BGA ball assignment in our component library. VDDS_MEM (1.8V) is assigned to B17 instead of B18. And, B17 is data line 14 of the SDRAM and should have been left NC. Therefore we have tied one data line to a high-level... I think we can fix that for our samples but it needs some time and we run out of components for the samples. Especially memory chips have quite a long lead time. For the series version this will be very easy to fix. Nikolaus ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [GTA04] When is the next and more powerful openmoko releasing
Hi, Dr. H. Nikolaus Schaller h...@goldelico.com writes: time for another update. ... Current status: the 1.8V is now working but the VDD2 (1.2 V) not. The TPS chip aborts the power up sequence early. We could solve that by adding a jump start resistor. ... Nikolaus, this project is a very interesting effort and i am glad to read you're steadily moving towards getting a modern and functional device as free as freerunner. This news are fairly encouraging, there was nothing like that on the community mailing list for quite a while. There is this one thing that bothers me though: i would be rather glad to see Joerg Reisenweber[1], one of the most clueful and insightful HW guys from the OpenMoko fame in your team; to me it looks like his experience could really help to not only kickstart your endeavor but to also cope with all those hurdles along the way. Sincerely wishing you best of luck and happy hacking. [1] http://wiki.openmoko.org/wiki/User:JOERG -- Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software! mailto:fercer...@gmail.com ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Address the WM8753 directly
On 11/08/2010 11:47 PM, Timo Juhani Lindfors wrote: Ed Kapiteine...@kapitein.org writes: Does anyone have pointers on how to address the hardware and its registers etc? I want to write the program in C and need a starting point. I think you need to write kernel space code to use it since there are shared resources like i2c that can not be used without proper locking (just guessing here). I don't know wether or not that is true, but there is nevertheless a good suggestion between the lines here - for a working example of how to use this hardware, you can look at the driver in the Linux kernel. :) ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
